We realized that 1/0 welding cable, carrying thousands of joules from the battery to the cars, was running alongside unshielded CAT5-USB cable. EM coupling between the two not only fouled the signal, but had already burned out a USB port on Gradman's laptop. Gradman solved this by connecting the relay boards to an additional laptop behind the cars. He connected the laptops via Ethernet---which is less susceptible to interference---and frantically rewrote his software lying on his belly on the desert playa.

Phillip and Limor of Adafruit and MAKE were kind enough to send me one of their Monochron clock kits, because they ported Dali Clock to it! I just finished building it, so now I have a hardware Dali Clock. It is sweet.